Positioning tool for thin-wall hollow pipe fitting

Abstract

The positioning tool for the thin-wall hollow pipe fitting comprises a base and a positioning assembly arranged on the base, an air cylinder is installed between the base and a positioning seat, the positioning assembly comprises a hollow supporting block, a positioning piece is arranged above the supporting block in an extending mode, and the positioning piece is connected with the air cylinder. The multiple positioning pieces are matched with a to-be-machined pipe fitting in shape and contain fixed cores, and the fixed cores are connected with the air cylinder to do lifting motion to be separated from the positioning pieces so as to loosen the to-be-machined pipe fitting or apply pressure to the positioning pieces to be expanded so as to clamp the to-be-machined pipe fitting. The device is simple in structural design, the to-be-machined pipe fitting is arranged on the outer circle of the positioning piece in a sleeving mode, the air cylinder pulls the fixed core to ascend and descend, the conical surface of the fixed core descends, the positioning piece is expanded, a workpiece is expanded, and the purpose of positioning and clamping is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of improved design of pipe clamping tools, in particular to a positioning tool for thin-walled hollow pipe fittings. Background Technique

[0002] Ultra-thin epoxy resin hollow pipe fittings have the characteristics of complex ports, thin walls, and slender pipes. They have good self-lubrication and low-noise characteristics in weight-reducing industrial products, such as the semiconductor and medical industries. When using conventional tooling fixtures for supporting use, there are the following disadvantages: it is very easy to deform the outer circle during ordinary clamping (roundness distortion), axial deformation (corrugation deformation) will also occur when pressing the front and rear end faces, when using a mandrel structure to process side wall holes, the mandrel will be damaged, and when using an internal air expansion structure, a cylinder and valve opening and closing are required, the structure is complex and not applicable to small-diameter pipe fittings.

[0003] Take Figure 6 The conventional fixture shown as an example. The thin-walled hollow pipe fitting is fixed in the Z-axis direction by a sleeve core method. The three-lobe boss slides freely and is inflated to be close to the inner wall of the hollow pipe fitting to clamp the workpiece. After the hollow pipe fitting is fixed, the upper and lower end notches for clearance are processed. The three-lobe boss can be freely replaced (universal base) to adapt to different specifications and sizes. Since the hollow pipe fitting is pressed from the end face, centered on the inner wall, and there is a machining position on the end face, there are the following problems: it cannot be automatically centered, the speed of taking and placing the hollow pipe fitting is slow, excessive axial pressure on the hollow pipe fitting will press the pipe wall to cause wrinkles and bending on the outer surface, the port of the three-lobe boss interferes with the machining position of the hollow pipe fitting, it is easy to touch the tool, using point support or surface support to clamp rigidly, the functions of the machine tool equipment cannot be fully utilized during the machining process, the design cost of the three-lobe boss is high, and it has a high degree of specialization. For general-purpose equipment, it does not have the flexibility of machining.

[0004] In the prior art, the patent with the publication number of CN210678561U discloses a hollow pipe positioning device in a strain clamp assembly device, including a base and a positioning member arranged on the base. The positioning member includes a positioning pipe that can be inserted into the hollow pipe. One end of the positioning pipe is an expansion end, and at least two strip-shaped grooves are arranged on the expansion end. The strip-shaped grooves are arranged along the axial direction of the positioning pipe. A driving rod is inserted into the positioning pipe, and an expansion head located in the expansion end is arranged on the driving rod. One end of the driving rod away from the expansion head passes through the positioning pipe to form a handle. Driving the expansion head can expand or contract the expansion end. With the above structure, a hollow pipe positioning device in a strain clamp assembly device that is convenient for fixing the hollow pipe and avoiding deformation of the hollow pipe is provided.

[0005] In the above technical solution, the positioning tube sleeved inside the hollow tube is designed such that one end is an expansion end. The expansion head provided at the end of the driving rod is used to expand or contract the expansion end, thereby completing the clamping and disassembling operations of the hollow tube. Since the positioning tube and the expansion end are of a split design, it is relatively complicated to fix their positions, and they can only be arranged in the vertical opening and closing direction, which is not conducive to quick clamping and subsequent operations.

[0006] To solve one of the above problems, the present application provides a positioning tooling for thin-walled hollow pipe fittings. Utility Model Content

[0007] The purpose of the present utility model is to solve the problems existing in the prior art, and a positioning tooling for thin-walled hollow pipe fittings is proposed. Its structural design is simple. The pipe fitting to be processed is sleeved on the outer circle of the positioning piece, and the cylinder pulls the centering core to move up and down, so that the conical surface of the centering core descends and expands the positioning piece to tighten the workpiece, achieving the purpose of positioning and clamping.

[0008] To achieve the above purpose, the present utility model adopts the following technical solution: A positioning tooling for thin-walled hollow pipe fittings, including a base and a positioning assembly provided on the base. A cylinder is installed between the base and the positioning seat. The positioning assembly includes a hollow support block. A positioning piece extends above the support block. Multiple positioning pieces match the shape of the pipe fitting to be processed and accommodate a centering core. The centering core is connected to the lifting action of the cylinder to disengage from the positioning piece to loosen the pipe fitting to be processed or apply pressure to the positioning piece to expand and clamp the pipe fitting to be processed.

[0009] Further, a connecting piece extends outside the hollow hole position of the support block as described above. The connecting piece is an unclosed cylinder.

[0010] Further, the connecting piece extends to form a first positioning piece and a second positioning piece that are separated from each other to meet the special shape design of the pipe fitting to be processed. The upper and lower ends are both provided with a shape with a notch, and the projections of the notches in the upper and lower parts overlap in the axial direction.

[0011] Further, the positioning piece is located inside the connecting piece and forms a step position. The pipe fitting to be processed is sleeved outside the positioning piece and is limited by the step position of the connecting piece.

[0012] Further, holes are opened on the connecting piece as described above. An arc-shaped groove is machined between the connecting piece and the support block to increase the flexibility of the connecting piece itself, so that it can rebound and reset after deformation.

[0013] Further, the support block is fixed on a fixed seat, and the fixed seat is connected to the base, generally by bolt connection.

[0014] Further, a cylinder is installed on the fixing base as described above. The cylinder is located in the cavity jointly formed by the supporting block and multiple positioning pieces to meet the installation position and lifting requirements of the centering core.

[0015] Further, the centering core as described above is in the shape of a frustum. The small-diameter end of the centering core is connected to the telescopic shaft of the cylinder, so that the centering core can be pushed out to disengage from the positioning pieces for sleeving the pipe fitting to be processed. On the contrary, when the centering core is pulled inward, it can expand the positioning pieces to support the inner wall of the pipe fitting to be processed.

[0016] Further, the base as described above is composed of a bottom plate and a hollow frame plate. The fixing base is installed on the frame plate, generally connected by bolts.

[0017] Further, a plurality of rib plates are provided between the bottom plate and the frame plate as described above to increase the structural strength of the base.

[0018] Compared with the prior art, the beneficial effects of the present utility model are as follows: The structure of the device is simply designed. The pipe fitting to be processed is sleeved on the outer circle of the positioning pieces. The cylinder drives the centering core to move up and down, so that the conical surface of the centering core descends and expands the positioning pieces to tighten the workpiece, achieving the goals of non-deformation in positioning and clamping and simple and quick operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a perspective view of the present utility model;

[0020] Figure 2 is an exploded schematic view of the present utility model;

[0021] Figure 3 is a schematic view of the positioning component and the pipe fitting to be processed of the present utility model;

[0022] Figure 4 is Figure 1 the top view of;

[0023] Figure 5 is Figure 4 the semi-sectional view in the A-A direction in;

[0024] Figure 6 is the exploded view of the conventional fixture before improvement.

[0025] In the figure: 1. Base; 2. Fixing base; 3. Cylinder; 4. Centering core; 5. Positioning component; 51. First positioning piece; 52. Second positioning piece; 53. Connecting piece; 54. Supporting block; 6. Pipe fitting to be processed; 7. Three-lobe boss. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "fixed", "installed", "connected", "set", etc. should be understood in a broad sense. For example, when an element is referred to as "fixed to" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "installed on" another element, it can be directly installed on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements.

[0028] For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0029] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0030] Embodiment 1

[0031] Refer to Figures 1-5As shown in the figure, a positioning tooling for thin-walled hollow pipe fittings of the present utility model includes a base 1 and a positioning component 5 arranged on the base 1. Among them, the base 1 is a universal base 1 that can be installed on a machine tool. A cylinder 3 is installed between the base 1 and the positioning seat. The positioning component 5 includes a hollow support block 54, that is, a through hole is machined in the middle part of the support block 54. A positioning piece extends above the support block 54. The positioning piece is made of spring steel, with a thickness of 0.8 MM and a shape of a cylindrical hollow structure. Multiple positioning pieces match the shape of the pipe fitting 6 to be processed and accommodate a centering core 4. The centering core 4 is connected to the lifting action of the cylinder 3 to disengage from the positioning piece and release the pipe fitting 6 to be processed, or press on the positioning piece to expand and clamp the pipe fitting 6 to be processed. Among them, the outer surface of the centering core 4 is a conical surface. The centering core 4 is in the cavity surrounded by multiple positioning pieces. When the centering core 4 moves downward along the axial direction, it can expand the positioning piece. The centering core 4 is made of an elastic material, such as acetal resin.

[0032] Embodiment 2

[0033] Referring to Figures 1-5 As shown in the figure, on the basis of the technical solution of Embodiment 1, a positioning tooling for thin-walled hollow pipe fittings, such as Figure 3 As shown in the figure, for the specific structural design of the positioning component 5, a connecting piece 53 extends outside the hollow hole position of the support block 54. The connecting piece 53 is an unclosed cylinder, that is, the support block 54 extends upward outside its own through hole to form a non-circular cylinder. In addition, holes are drilled in the connecting piece 53, and an arc-shaped groove is machined between the connecting piece 53 and the support block 54 to increase the flexibility of the connecting piece 53 itself, so that it can rebound and reset after deformation.

[0034] Furthermore, the connecting piece 53 extends to form a first positioning piece 51 and a second positioning piece 52 that are separated from each other. Figure 3 The positioning piece in[] is designed into a two-piece structure to meet the special shape design of the pipe fitting 6 to be processed. The upper and lower ends are both provided with a shape with a notch, and the projections of the notches in the upper and lower parts overlap in the axial direction. Since the end face of the notch part needs to be processed, at this time, to ensure that the second positioning piece 52 matching the notch shape has sufficient structural strength, if a three-piece positioning piece structure is adopted, the spacing and size of the other two positioning pieces are relatively small, and their own structural strength is not conducive to rebounding and resetting. Of course, according to the actual shape of the pipe fitting 6 to be processed, if the structural strength requirements are met, the positioning piece can also be designed into a three-piece or multi-piece structure.

[0035] Furthermore, the positioning piece is located inside the connecting piece 53 and forms a step position. The pipe fitting 6 to be processed is sleeved outside the positioning piece and is limited by the step position of the connecting piece 53. Specifically, the positioning piece extends upward from the annular inner side of the connecting piece 53, and a step position is formed between the positioning piece and the upper end surface of the connecting piece 53. In this way, when the pipe fitting 6 to be processed is sleeved downward outside multiple positioning pieces, it can be blocked and limited by the step position of the connecting piece 53, which can play a role in bottom positioning.

[0036] Embodiment III

[0037] Referring to Figures 1-5 As shown, on the basis of the technical solution of Embodiment I, a positioning tooling for thin-walled hollow pipe fittings, combined with Figure 1 and Figure 2 it can be known that the support block 54 is fixed on the fixed seat 2, and the fixed seat 2 is connected to the base 1, generally by bolts. Furthermore, a cylinder 3 is installed on the fixed seat 2, generally by screwing the end of the cylinder barrel of the cylinder 3. The cylinder 3 is located in the cavity jointly formed by the support block 54 and multiple positioning pieces to meet the installation position and lifting requirements of the centering core 4.

[0038] Furthermore, the centering core 4 is in the shape of a frustum of a cone. The centering core 4 includes a small-diameter end and a large-diameter end. The small-diameter end of the centering core 4 is connected to the telescopic shaft of the cylinder 3, and the connection method can adopt a spiral assembly method for connection and fixation, which is convenient for quick installation and disassembly. The diameter of the centering core 4 gradually increases from the small-diameter end to the large-diameter end to achieve the effect of different expansion sizes.

[0039] Furthermore, the base 1 is composed of a bottom plate and a hollow frame plate. The frame plate is a rectangular block with a rectangular through hole processed in the middle. The fixed seat 2 is installed on the frame plate, generally by bolts. In addition, multiple rib plates are provided between the bottom plate and the frame plate. The bottom and side parts of the rib plates are respectively screwed to the side parts of the bottom plate and the frame plate to increase or decrease the structural strength of the base 1.

[0040] Figure 6To improve the positioning tooling used for thin-walled hollow pipes, the whole device features: in terms of installation, the base 1 can be fixed in the T-slot of the machine by 4 bolts; in terms of material, the base 1 is made of lightweight 6160, including reinforcing ribs, the three-petal boss 7 is made of 45# medium carbon steel, the slider needle is made of low-damping Saigang, and the middle core is made of an imported spring preloaded slider. The operation process is: first, the pipe 6 to be processed is inserted barehanded into the three-petal boss 7 (with a chamfered introduction at the top), and under the spring preload, the slider needle extends 2MM outside the diameter of the three-petal boss 7, and the rounded corners at the top of the needle are convenient for expansion and contraction. The pipe 6 to be processed slides down to coincide with the bottom of the three-petal boss 7, and the slider needle supports the inner hole of the pipe wall under the spring counter pressure, and the gap between the slider needle and the inner wall is 0.05-0.1MM. The pipe 6 to be processed is positioned by inserting 3 rows of offset, and the upper and lower notches of the pipe 6 to be processed can be machined. The existing problems are: it cannot automatically center, the speed of placing and taking the pipe 6 to be processed is slow, the slider needle is hard against the inner wall of the pipe 6 to be processed in a point support or surface support manner, which can easily cause wrinkles or deformation of the outer surface. In addition, the upper and lower ends of the pipe 6 to be processed interfere with the processing position, and accidents caused by tool collision may easily occur during the processing. The design cost is high and it is highly specialized. For universal tooling fixtures, it does not have the flexibility to clamp pipes of different specifications and sizes.

[0041] The solution to the technical problems existing in the positioning tooling for thin-walled hollow pipes before improvement is as follows:

[0042] 1. Evenly distribute the clamping force to ensure that when the clamp is clamping the pipe, the clamping force can be evenly distributed on the surface of the pipe to avoid deformation caused by excessive local pressure. The shape design of multiple positioning pieces and the fixed core 4 is adopted;

[0043] 2. Flexible clamping, using clamping elements with a certain degree of elasticity, such as rubber, polyurethane, etc., to provide sufficient clamping force while reducing the rigid impact on the pipe fittings, and reasonable selection of materials;

[0044] 3. Rapid positioning and clamping, design of rapid positioning mechanism and clamping mechanism to improve operating efficiency, coordination of multiple positioning pieces and fixed core 4;

[0045] 4. Adaptable design: the fixture should have a certain size adjustment range to adapt to thin-walled pipes of different diameters, and a variable diameter shape design of multiple positioning pieces and the fixed core 4.

[0046] The working principle of the device of the utility model is that, first, each component is installed, assembled and fixed in sequence, and the cylinder 3 is started to work first, so that the fixed core 4 is pushed outward and out of contact with the positioning piece. At this time, the pipe 6 to be processed can be quickly inserted and sleeved on the outside of the positioning piece until it contacts the step position of the connecting piece 53 to complete the bottom positioning, and then the cylinder 3 is started again and the fixed core is pulled inward so that multiple positioning pieces are expanded and abut against the inner wall of the pipe 6 to be processed, thereby completing the support and fixation of the inner wall surface of the pipe 6 to be processed, meeting the fixing requirements of the next processing and assembly; conversely, the cylinder 3 is started to push the fixed core 4 outward and out of contact with the positioning piece. At this time, the positioning piece itself is elastically reset to restore its original state, and the pipe 6 to be processed can be quickly taken out from it. The lifting height of the fixed core 4 depends on the expansion size of the positioning piece, that is, it meets the requirements of expanding the pipe 6 to be processed and cannot be wrinkled and deformed. The parameters are selected according to the actual working conditions, which will not be repeated here.

[0047] In the device of the utility model, the assembly and matching relationship of the various components involved, the cylinder 3 and the like are existing technologies or materials, and the relevant technical personnel can directly purchase or customize them from the market according to the required product models and specifications.

[0048] The electrical components appearing in the text are all connected to an external main controller and 220V mains or industrial electricity, and the main controller can be a conventional known device such as a computer that plays a control role.

[0049] The above is only a preferred specific embodiment of the utility model, and the common knowledge such as the known specific structure and characteristics in the scheme is not described too much here. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above-mentioned embodiment, and the utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of the utility model. Therefore, no matter from which point of view, the embodiment should be regarded as exemplary and non-restrictive. Any technician familiar with the technical field within the technical scope disclosed by the utility model, according to the technical scheme of the utility model and its utility model concept, shall be covered within the protection scope of the utility model.

Claims

1. A positioning tool for a thin-walled hollow pipe, comprising a base (1) and a positioning assembly (5) arranged on the base (1), characterized in that: A cylinder (3) is installed between the base (1) and the positioning seat, and the positioning assembly (5) includes a hollow support block (54). A positioning piece is extended above the support block (54). The plurality of positioning pieces match the shape of the pipe (6) to be processed and accommodate a fixed core (4). The fixed core (4) is connected to the cylinder (3) for lifting and lowering to separate from the positioning piece and release the pipe (6) to be processed, or to apply pressure to the positioning piece to expand it so as to clamp the pipe (6) to be processed.

2. A positioning tool for thin-walled hollow pipes according to claim 1, characterized in that: A connecting piece (53) is extended outside the hollow hole of the supporting block (54), and the connecting piece (53) is a non-closed cylinder.

3. A positioning tool for thin-walled hollow pipes according to claim 2, characterized in that: The connecting piece (53) extends to form a first positioning piece (51) and a second positioning piece (52) which are separated from each other.

4. A positioning tool for thin-walled hollow pipes according to claim 3, characterized in that: The positioning piece is located on the inner side of the connecting piece (53) and forms a step position. The pipe fitting (6) to be processed is sleeved on the outside of the positioning piece and is limited by the step position of the connecting piece (53).

5. A positioning tool for thin-walled hollow pipes according to claim 4, characterized in that: The connecting piece (53) is provided with a hole, and an arc groove is processed between the connecting piece (53) and the supporting block (54).

6. A positioning tool for thin-walled hollow pipes according to claim 5, characterized in that: The support block (54) is fixed on the fixing seat (2), and the fixing seat (2) is connected to the base (1).

7. A positioning tool for thin-walled hollow pipes according to claim 6, characterized in that: The cylinder (3) is installed on the fixing seat (2), and the cylinder (3) is located in a cavity formed by the supporting block (54) and a plurality of positioning sheets.

8. A positioning tool for thin-walled hollow pipes according to claim 7, characterized in that: The fixed core (4) is in the shape of a frustum, and the small diameter end of the fixed core (4) is connected to the telescopic shaft of the cylinder (3).

9. A positioning tool for thin-walled hollow pipes according to claim 8, characterized in that: The base (1) is composed of a bottom plate and a hollow frame plate, and a fixing seat (2) is installed on the frame plate.

10. A positioning tool for thin-walled hollow pipes according to claim 9, characterized in that: A plurality of rib plates are arranged between the bottom plate and the frame plate.

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